Question about 2003 GMC Envoy

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Ac unit is not working properly just replaced the compressor the dryer and the orfice and it blows cold one minute and then the unit gets hot and dies the motor down.. What could be causing this? the unit is not over pressurized it has been checked

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  • 52 Answers

I would make sure that the electric fan clutch is coming on. Sounds like the a/c compressor may be building up high head pressure and the fan clutch is not drawing air through the condensor to cool it down.

Posted on Sep 05, 2010

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If the car was retro fitted with R134a this was a common problem. There was a low side pressure sensor that needs to be changed. R134a runs different pressures than the r12.. When you go down the road the condenser cools off the system and the pressure drops below the minimum pressure. You need to make sure that the system is fully charged, not just cold to the feel. Both pipes coming out of the firewall need to be the same temp. this makes sure that the evaporator is flooded.
I hope this helped. Re-post if you need more info. Have a nice day and good luck.

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you have moisture in the system this causes your expancion valve to freeze up an stop working, thats why it works for sort time and when it de-freezes stars working again. you need to do a EVAC & RECHARGE with a good AC service equipment, specially attention to pull vacumm por at least 20minutes so you get all moisture out of the system.
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no dealer has a reset for the a/c system by you mentioning that you replace everything it means the a/c compressor,air dryer,and the most important the orfice tube. if you hadnt replace the orfice tube wich converts the liquid into gas when it gets hot thats your problem.alot of mechanics wont change it as an a/c mechanic will.

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